A new analysis of satellite data from the last 19 years reveals that fresh water from melting glaciers has caused the sea level around the coast of Antarctica to rise by 2 centimeters more than the global average of 6 centimeters.

Researchers at the University of Southampton detected the rapid rise in sea-level by studying satellite scans of a region that spans more than a million square kilometers.

The melting of the Antarctic ice sheet and the thinning of floating ice shelves has contributed an excess of around 350 giga-tons of freshwater to the surrounding ocean, they say, and this has led to a reduction in the salinity of the surrounding oceans that has been corroborated by ship-based studies of the water. Freshwater is less dense than salt water and so researchers say that in regions where an excess of freshwater has accumulated, a localized rise in sea level is expected.

Icicles are formed by the melting of a glacier in west Antarctica. The melt here is rapid and has been accelerating, injecting greater quantities of freshwater into the ocean and raising sea levels. Credit: Mike Meredith

In addition to satellite observations, the researchers also conducted computer simulations of the effect of melting glaciers on the Antarctic Ocean.

"The computer model supports our theory that the sea-level rise we see in our satellite data is almost entirely caused by freshening (a reduction in the salinity of the water) from the melting of the ice sheet and its fringing ice shelves," says Craig Rye, lead author of the paper that has been published in the journal Nature Geoscience.

"The interaction between air, sea and ice in these seas is central to the stability of the Antarctic Ice Sheet and global sea levels, as well as other environmental processes, such as the generation of Antarctic bottom water, which cools and ventilates much of the global ocean abyss."

The research was carried out with researchers at the National Oceanography Centre and the British Antarctic Survey.

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